Didi Tech

Aug 7, 2023 · Backend Development

How Didi Achieved Cross‑Datacenter Elasticsearch Replication for Strong Consistency

This article explains Didi's self‑developed DCDR system that replicates Elasticsearch indices across data‑center clusters, detailing its design goals, core mechanisms, chain construction, historical data recovery, real‑time sync, and data‑quality validation to ensure high availability and strong consistency.